Thermal Conductivity of Altered Rock in the Green Tuff Regions. Studies on the Thermal Conductivity of Porous Rocks.:Studies on the Thermal Conductivity of Porous Rocks
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概要
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The effective thermal conductivity of one hundred twenty-eight samples obtained from altered rocks in the green tuff regions has been measured at moist and saturated conditions at 20°C by a transient hot wire comparison method in order to clarify the effect of moisture on the conductivity of the rocks and to characterize the thermal conductivity of solid phase in the rocks. Most of the samples contain quartz, feldspar, calcite, dolomite, chlorite, sericite, chlorite/smectite mixed/layer and mica/smectite mixed-layer, and the quantitative ratio of each mineral contained in the sample is relatively high. The effective thermal conductivity has been evaluated by means of a new three phase equation proposed by the authors recently. The results show that the measured values of the conductivity of the rocks have been correlated with values estimated from the new equation within ±20% for all samples. The thermal conductivity of the solid phase in the rocks has been derived from the measured values by using the new equation, also. Further, using an effective thermal conductivity model for a multi-solid-component system modified from the two phase random model proposed by Woodside and Messmer (1961), the thermal conductivity of each mineral in the solid phase has been obtained as the result of multi-variate analysis on the relationship between the thermal conductivity of the solid phase in the rocks and fractions of individual mineral components in them. Calculated values of thermal conductivity of quartz, feldspar, calcite, dolomite and chlorite in the above mineral group based on the multi system model is close enough to their literature values obtained by Horai (1971). This shows that the effective thermal conductivity equation for the multi-solid-component system proposed by the authors also is applicable to evaluate the thermal conductivity of each mineral in the solid phase of the rock.
- 日本地熱学会の論文
日本地熱学会 | 論文
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